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File-drop content is visible through the gallery app (NC-SA-2019-012)

22nd October 2019

Risk level: Low

CVSS v3 Base Score: 5 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N)

CWE: Improper Authorization (CWE-285)

HackerOne report: 719426

Description

Improper authorization in Nextcloud server 17.0.0 causes leaking of previews and files when a file-drop share link is opened via the gallery app.

Affected Software

  • Nextcloud Server < 17.0.1 (CVE-2020-8119)
  • Nextcloud Server < 16.0.6 (CVE-2020-8119)
  • Nextcloud Server < 15.0.13 (CVE-2020-8119)

Action Taken

The error has been fixed.

Resolution

It is recommended that the Nextcloud server is upgraded to 17.0.1.

Acknowledgements

The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory:

  • Olav Seyfarth (nursoda) - Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0.

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